Fig. 10. A m+ extremum occurs at the top of the left-hand
shape in this figure. In accordance with our Semantic Interpretation
Rule, the process terminating at this extremum is a squashing
process; i.e., it explains the flattening at the top of the shape.
Now let us continue this process; i.e., continue pushing the
boundary in the direction shown. At some point, an indentation
will be created, as shown in the top of the right-hand shape.
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